I did't find any clues of interceptions yet. But the wargots will attack the laputa, and there will be a "new model spaceship". And maybe the starghosts are an another alien race.
Warning! Possible spoilers! /strategic/configs/stratgame/research/preq.txt - the whole research tree Starghosts, wargots, new model spaceships, reticulan aftermath...... AND Look at these concepts: concept 1 concept 2 Wargots?
Look at these screenshots: screenshot 1 screenshot 2 The reticulans have the same biotechnology in 2050 as in 2005. I think these chambers aren't reticulan facilities.